Unacknowledged (adjective)

Not acknowledged or recognized as existing or true.

Origin:

From the word acknowledge meaning "to recognize or admit the existence or truth of", and the prefix un- meaning not.

Examples:

1. The problem went unacknowledged for far too long.
2. The employee's hard work went unacknowledged by management.
3. The elephant in the room remained unacknowledged during the meeting.
4. The unacknowledged debt led to the company's bankruptcy.
5. The unacknowledged bias led to unfair treatment of certain individuals.